Design Guide

Material used : Silicone rubber
Function :Establish contact between the LCD & PCB .
All elastomeric inter-connectors are 'custom made' Zebra connectors offer a wide variety of application possibilities. Unlike other connectors, they do not entail soldering to make reliable connections. They require a minimum of installation hardware considerations, allowing for very small packaging structures to support low profile display and microelectronic interfacing.
When properly dimensioned, long-life performance can be assured and airtight connections without additional precautions can be realized.

Pitch of Inter-Connector(P)

 - More than three (3) conductive contacts per electrode of PCB/LCD.
 - Distance from center-center of each conductor in a connector
 - Alternate layers of insulation width (i) & conductor width (c) silicone      material evenly spread over the entire length of inter-connector.
 - e.g. Pitch (0.1 mm) = i (0.05 mm) + c (0.05 mm)
 - Basically, 2 conductors per electrode are often adequate, but 3 conductors per electrode are always recommended to ensure reliable  connections and to eliminate "intermittent contact"
 - e.g. LCD pitch = 1.2 mm (with contact pad 0.6 mm) Inter-connector pitch = 0.18 mm is recommended"

Inter-Connector - Length(L)

  • L > Length of LCD pads : ±0.2mm or above

  • The overall length is recommended to be extended a min. of 0.5mm beyond the edge of the contact at each end of the connector.

 

Inter-Connector - Width(W)

  • W ≤ width of LCD ledge.

  • Its design is critical in eliminating buckle when clamping force is applied to the connector.

  • If the buckle is too severe, contact shall lost completely.

  • If connector width is too thin, it may require holder to facilitate assembly, prevent accidental side contact & eliminate alignment problems.

 

Inter-Connector - Uncompressed Height(H)

  • Connector height is determined by the separation distance between LCD & PCB, including tolerance variations.

  • It is critical to calculate the correct compression ( deflection rate ) to be applied to the connector for reliable connections.

  • Compression ( deflection rate ) to be applied to connectors varies with different types, dimensions of inter-connectors.

  • Generally speaking, compression set for inter-connector is ~ 10 - 15%

  • Guideline for reference :

    • H < 6 mm, ~ 15% compression of connector's height

    • 6 mm < H < 10 mm, ~ 13% compression of connector's height

    • ≥10 mm, ~ 10% compression of connector's height

    • X = n / 1 - p Formula to determine the uncompressed height of the connector
       

  • x = uncompressed height

  • n = compressed height (= separation distance between LCD & PCB)

  • p = percent of desired compression

  • Compression load should be spread evenly over the top surface of the inter-connectors.

  • To avoid bending, we recommend to use holders especially for tall height inter-connector.

  • Holder should give space for horizontal expansion of the inter-connector during compression

Conductive Core Width

  • Conductive width is important in determining the cost, resistance and hardness of the connector.

  • For connector width > 1.3 mm, the more conductive material a connector contains, the more expensive it is.

  • Standard core width = 0.6 mm

Applications

Design Guide

  • Pitch (P): More than three (3) conductive contacts per electrode of PCB/LCD

  • Length (L) : + 2mm or above

  • Uncompressed Height (H) : Distance between LCD & PCB +10-15% compression rate

  • Width (W) : determined by the width of LCD ledge

Specifications

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